Shulou(Shulou.com)06/01 Report--

In this issue, the editor will bring you about how to use POST, DELETE and PUT methods. The article is rich in content and analyzes and narrates it from a professional point of view. I hope you can get something after reading this article.

First, RESTful style and HTTP method

Friends who are familiar with RESTful style should know that RESTful style API uses HTTP method to express the operation of resources.

Commonly used HTTP methods RESTful style semantics (operation) GET query, get data POST add, submit data DELETE delete data PUT update, modify data

In the previous article, we showed you how to use WebClient as a Http client to send GET requests and receive response results. This section introduces you to POST, DELETE, PUT.

Other methods such as POST are consistent with the GET method when using the following methods:

Block () blocking method to get response results, subscribe () non-blocking asynchronous result subscription method

Retrieve () acquires the HTTP response body, and exchange () can obtain not only the HTTP response body, but also the HTTP status code, headers, cookies and other HTTP message information.

Use Mono to receive the response results of a single object, and use Flux to receive the response results of collection class objects.

Placeholder syntax parameter transfer mode

So for the above information, please refer to: detailed lecture responsive WebClient article 2-GET request blocking and non-blocking invocation method details. This article only introduces the differences between POST, DELETE, PUT and GET in the process of use.

In order to facilitate the follow-up development and testing, first introduce a website to you. JSONPlaceholder is a website that provides free online REST API, and we can use the url address it provides to test network requests and request parameters. Or when our program needs to get some simulation data, simulation pictures can also use it.

Second, Post request to send JSON string, object, form data 2. 1. Use the Post method to send JSON string data public class OtherTest {/ / create webClient private WebClient webClient = WebClient.builder () .baseUrl ("http://jsonplaceholder.typicode.com") .build ()) to the server [@ Test] (https://my.oschina.net/azibug) public void testPostJsonStr () {/ / JSON string String jsonStr = "{\" userId\ ": 1,\" title\ ":\" zimugtest\ ",\" body\ ":\" Alphabet Brother for testing\ " / / send request Mono mono = webClient .post () / / POST request .uri ("/ posts") / / request path .contentType (MediaType.APPLICATION_JSON) / / JSON data type.body (BodyInserters.fromValue (jsonStr)) / / JSON string data .response () / / get the response body .bodyToMono (String.class) / / response data type conversion / / output result System.out.println (mono.block ());}}

The response result is printed as follows, "the request data of the http://jsonplaceholder.typicode.com/posts/1" service is the response data." The response result is also a JSON string:

2.2. Send the object to the server in the form of JSON data [@ Test] (https://my.oschina.net/azibug) public void testPostJson () {/ / build request sending object PostDTO postDTO = new PostDTO (); postDTO.setUserId (110); postDTO.setTitle ("zimug-test"); postDTO.setBody ("Alphabet Brother Post Test") / / send request Mono mono = webClient .post () / / send POST request .uri ("/ posts") / / Service request path, based on baseurl .contentType (MediaType.APPLICATION_JSON) / / in JSON data format .bodyValue (postDTO) / / send request body Object form. Response () / / get response body .bodyToMono (PostDTO.class) / / response data type conversion / / output result System.out.println ("=" + mono.block ());}

The response result is printed as follows, and the response result is received using PostDTO. Because "the request data of the http://jsonplaceholder.typicode.com/posts/1" service is the response data. The print result is the toString () method of the PostDTO object

2.3.POST simulated form data submission [@ Test] (https://my.oschina.net/azibug) public void testFormSubmit () {/ / form data parameter setting MultiValueMap map = new LinkedMultiValueMap (); map.add ("title", "zimug-test"); map.add ("body", "Alphabet Brother Test") / / send request Mono mono = webClient .post () / / send POST request .uri ("/ posts") / / request path .contentType (MediaType.APPLICATION_FORM_URLENCODED) / / form data type.body (BodyInserters.fromFormData (map)) / / form data. Take the response bodyToMono (String.class) / / response data type conversion / / output result System.out.println (mono.block ());}}

Because the response result is accepted as a string, the output and "2. 1. Use the Post method to send JSON string data to the server. "the output is the same.

Use the DELETE method to delete resources

Delete an existing resource and use the delete () method of webClient. This method sends a HTTP DELETE method request to the resource represented by URL.

[@ Test] (https://my.oschina.net/azibug)public void testDelete () {/ / send Delete request webClient.delete () .uri ("/ posts/1"); / / request path}

On the basis of the test class in the previous chapter, write the test case of the above code. The above code means to delete the first post in the posts list.

Fourth, use the PUT method to modify resources

Modify an existing resource, using the put () method of webClient. This method sends a HTTP PUT method request to the resource represented by URL.

[@ Test] (https://my.oschina.net/azibug)public void testPut () {/ / data object to be modified PostDTO postDTO = new PostDTO (); postDTO.setId (1); postDTO.setBody ("Alphabet Brother Put Test") Mono mono = webClient .put () .uri ("/ posts/1") / / Service request path, based on baseurl .contentType (MediaType.APPLICATION_JSON) .bodyValue (postDTO) / / send the request body. response () / / get the response bodyToMono (PostDTO.class) / / response data type conversion / / output result System.out.println ("=" + mono.block ());}

The RESTful style semantics of the above code is: modify the first post in the posts list. The output is as follows, which is the result of modifying the data:

This is how to use the POST, DELETE and PUT methods shared by the editor. If you happen to have similar doubts, you might as well refer to the above analysis to understand. If you want to know more about it, you are welcome to follow the industry information channel.

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